We want to thank Dr Michele Bernardi and Dr René Gommes
from the Agrometeorology Group, Environment and Natural Resources Service
Research, Extension and Training Division, Sustainable Development Department of
the Food and Agriculture Organization of the United Nations for their assistance
in planning and writing the Frost book. We want to thank our friends: Dr Luciano
Mateos for encouraging us to write the book and Dr Helena Gomez MacPherson and
Angela Scappaticci for their friendship and support during visits to FAO in
Rome. Some thanks are due to Professors Donatella Spano and Pietro Deidda in the
Dipartimento di Economia e Sistemi Arborei for providing encouragement and
facilities during part of the book preparation at the University of Sassari,
Italy. We also thank Dr Kyaw Tha Paw U and Dr Michael J. Singer from the
Department of Land, Air and Water Resources for their continued support
throughout this effort.

The authors thank their respective institutions, Department of
Land, Air and Water Resources - University of California at Davis; Instituto
Superior de Agronomia - Technical University of Lisbon; and Department of
Agricultural and Resource Economics - Washington State University. We also thank
the Food and Agriculture Organization of the United Nations and the University
of California for financially supporting Dr Snyder's Sabbatical Leave to work on
the book in Italy. We thank the Fundação para a Ciência e
Tecnologia (FCT) and Fundação Luso-Americana para o
Desenvolvimento for financially supporting Dr de Melo-Abreu's missions to the
University of California at Davis to work on this book.

The authors thank Dr António Castro Ribeiro for
supplying data from his thesis, which helped us to develop the analysis for wind
machines. We also thank Neil O'Connell from the Tulare County Cooperative
Extension - University of California for supplying information on the costs of
frost protection. In addition, numerous people took the time to answer our
survey on Appropriate Technologies and we thank them for their responses.
Finally we want to thank the reviewers of the book for their valuable comments
and suggestions.

Final editing of language and style on behalf of FAO was by
Thorgeir Lawrence, Reykjavik, and layout and pre-press preparation was by Studio
Bartoleschi, Rome, Italy.